Place it right after the visual reveal in a short edit, not before it. For a bigger gag, follow it with a classic fart for contrast, or lead in with the fart meme sound and let this clip close the sequence alone.
このサウンドについて
This clip is a very brief dry fart effect, a short raspy squeak that lasts just a fraction of a second with no voice or music. It feels cheeky and a little gross in a harmless way, landing as a quick embarrassed punchline rather than a long gross-out moment, which makes its tiny burst easy to recognise instantly.